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Software product lines (SPL) are of great significance to the software development process as they rely on identifying commonalities within an application domain in order to facilitate component integration to build new software products. The main focus of SPL is the development of software systems in a single domain where some basic functionality is reused over the developed systems. However, when it comes to cross-domain component reuse, SPL development processes always encounter difficulties in integrating heterogeneous components due to different architectural assumptions. This paper establishes a significant distinction of component interfaces and utilises it to derive the building block of a SPL that can support developing cross-domain software reuse.